Distinct clinical features associated with microsatellite instability in colorectal cancers of young patients.

Abstract:

:The Hong Kong Chinese population has an unusually high incidence of colorectal cancer in the young, suggestive of hereditary susceptibility. To search for a genetic basis for this predisposition, we studied the incidence of microsatellite instability (MSI) in paraffin-embedded colectomy specimens of 124 young (<50 years old) Chinese colorectal cancer patients referred to the Hong Kong Hereditary Gastrointestinal Cancer Registry from 1995 to 1998. By medical record review and personal interview, we searched for distinct clinical features associated with the manifestation of MSI in this group of patients. For patients with MSI tumours, blood was taken for detection of germline mutation in 2 mismatch repair (MMR) genes. MSI was present in 33 tumours from 23 males and 10 females (26.6%). Ongoing mutation analysis has so far identified MMR gene mutations in 8 patients with MSI tumours. The incidence of MSI increased significantly with decreasing age at cancer diagnosis. For patients aged 30 to 49, MSI tumours were located mainly at the proximal colon. However, for exceptionally young patients (<30 years), MSI tumours tended to be at the distal large bowel. This observation suggested a differential activity of the MMR pathway in colorectal carcinogenesis in different age groups. On multivariate analysis, young age at cancer diagnosis, proximal tumour location, a strong family history of colorectal cancer, and a personal history of metachronous cancer were independent predictors for MSI status. This knowledge may have an impact on the management of young colorectal cancer patients and their families.

journal_name

Int J Cancer

authors

Ho JW,Yuen ST,Chung LP,Kwan KY,Chan TL,Leung SY,Chan AS,Tse Cw,Lam PW,Luk IS

doi

10.1002/1097-0215(20000720)89:4<356::aid-ijc7>3.0.

keywords:

subject

Has Abstract

pub_date

2000-07-20 00:00:00

pages

356-60

issue

4

eissn

0020-7136

issn

1097-0215

pii

10.1002/1097-0215(20000720)89:4<356::AID-IJC7>3.0.

journal_volume

89

pub_type

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